MEASUREMENTS AND SCIENTIFIC TOOLS LESSON 2

DESCRIPTIONS 2 TYPES OF DESCRIPTIONS 1. Quantitative- uses numbers to describe the observation. Ex. There are 3 dogs 2. Qualitative- uses your senses(sight, sound, smell, touch, taste) to describe an observation. Ex. The salty fries

INTERNATIONAL SYSTEM OF UNITS Known as SI units Derived fro seven base units. Adopted by all scientists Table 2 Prefixes: indicate a fraction or a multiple of the base unit Prefixes are based on the powers of ten Table 3

PRECISION VS. ACCURACY 4 out of 4 basketballs fall in the basket. Accuracy is a description of how close a measurement is to an accepted or true value. -4 out of 4 basketballs hit the rim. Precision is a description of how similar or close measurements are to each other. 4 out of 4 basketballs fall in the basket.

Scientific Tools Science Journal Balances- triple beam balances, scales Thermometer Glassware Compound Microscope Computers Magnifying Lens Slide Pipette Dissecting Tools

Triple Beam Balances

Thermometer- measures temperature of substances 0⁰Celsius = 32⁰ Fahrenheit 1⁰Fahrenheit = 255.92⁰ Kelvin

Graduated Cylinders Meaures volume – liquids Meniscus – the lowest point of the “U” of the liquid

Beakers Must be on a flat surface to read the results. Measures liquids Must be eye level to read the results

Erlenmeyer Flasks Mixing, measuring and storing liquids